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| Mirrors > Home > ILE Home > Th. List > ge0addcl | GIF version | ||
| Description: The nonnegative reals are closed under addition. (Contributed by Mario Carneiro, 19-Jun-2014.) |
| Ref | Expression |
|---|---|
| ge0addcl | ⊢ ((𝐴 ∈ (0[,)+∞) ∧ 𝐵 ∈ (0[,)+∞)) → (𝐴 + 𝐵) ∈ (0[,)+∞)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elrege0 10140 | . 2 ⊢ (𝐴 ∈ (0[,)+∞) ↔ (𝐴 ∈ ℝ ∧ 0 ≤ 𝐴)) | |
| 2 | elrege0 10140 | . 2 ⊢ (𝐵 ∈ (0[,)+∞) ↔ (𝐵 ∈ ℝ ∧ 0 ≤ 𝐵)) | |
| 3 | readdcl 8093 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 + 𝐵) ∈ ℝ) | |
| 4 | 3 | ad2ant2r 509 | . . 3 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ (𝐵 ∈ ℝ ∧ 0 ≤ 𝐵)) → (𝐴 + 𝐵) ∈ ℝ) |
| 5 | addge0 8566 | . . . 4 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (0 ≤ 𝐴 ∧ 0 ≤ 𝐵)) → 0 ≤ (𝐴 + 𝐵)) | |
| 6 | 5 | an4s 590 | . . 3 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ (𝐵 ∈ ℝ ∧ 0 ≤ 𝐵)) → 0 ≤ (𝐴 + 𝐵)) |
| 7 | elrege0 10140 | . . 3 ⊢ ((𝐴 + 𝐵) ∈ (0[,)+∞) ↔ ((𝐴 + 𝐵) ∈ ℝ ∧ 0 ≤ (𝐴 + 𝐵))) | |
| 8 | 4, 6, 7 | sylanbrc 417 | . 2 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ (𝐵 ∈ ℝ ∧ 0 ≤ 𝐵)) → (𝐴 + 𝐵) ∈ (0[,)+∞)) |
| 9 | 1, 2, 8 | syl2anb 291 | 1 ⊢ ((𝐴 ∈ (0[,)+∞) ∧ 𝐵 ∈ (0[,)+∞)) → (𝐴 + 𝐵) ∈ (0[,)+∞)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∈ wcel 2180 class class class wbr 4062 (class class class)co 5974 ℝcr 7966 0cc0 7967 + caddc 7970 +∞cpnf 8146 ≤ cle 8150 [,)cico 10054 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 617 ax-in2 618 ax-io 713 ax-5 1473 ax-7 1474 ax-gen 1475 ax-ie1 1519 ax-ie2 1520 ax-8 1530 ax-10 1531 ax-11 1532 ax-i12 1533 ax-bndl 1535 ax-4 1536 ax-17 1552 ax-i9 1556 ax-ial 1560 ax-i5r 1561 ax-13 2182 ax-14 2183 ax-ext 2191 ax-sep 4181 ax-pow 4237 ax-pr 4272 ax-un 4501 ax-setind 4606 ax-cnex 8058 ax-resscn 8059 ax-1cn 8060 ax-1re 8061 ax-icn 8062 ax-addcl 8063 ax-addrcl 8064 ax-mulcl 8065 ax-addcom 8067 ax-addass 8069 ax-i2m1 8072 ax-0id 8075 ax-rnegex 8076 ax-pre-ltirr 8079 ax-pre-ltwlin 8080 ax-pre-lttrn 8081 ax-pre-ltadd 8083 |
| This theorem depends on definitions: df-bi 117 df-3or 984 df-3an 985 df-tru 1378 df-fal 1381 df-nf 1487 df-sb 1789 df-eu 2060 df-mo 2061 df-clab 2196 df-cleq 2202 df-clel 2205 df-nfc 2341 df-ne 2381 df-nel 2476 df-ral 2493 df-rex 2494 df-rab 2497 df-v 2781 df-sbc 3009 df-dif 3179 df-un 3181 df-in 3183 df-ss 3190 df-pw 3631 df-sn 3652 df-pr 3653 df-op 3655 df-uni 3868 df-br 4063 df-opab 4125 df-id 4361 df-po 4364 df-iso 4365 df-xp 4702 df-rel 4703 df-cnv 4704 df-co 4705 df-dm 4706 df-iota 5254 df-fun 5296 df-fv 5302 df-ov 5977 df-oprab 5978 df-mpo 5979 df-pnf 8151 df-mnf 8152 df-xr 8153 df-ltxr 8154 df-le 8155 df-ico 10058 |
| This theorem is referenced by: fsumge0 11936 rege0subm 14513 |
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